OCR B (Salters) - F334 - Chemistry of Materials - The Steel Story

A detailed set of notes based on The Steel Story module from the OCR B (Salters Spec)

Link to my notes on "What's in a Medicine?"

http://getrevising.co.uk/resources/ocr_b_salters_f334_chemistry_of_materials_whats_in_a_medicine

Link to my notes on "The Materials Revolution"

http://getrevising.co.uk/resources/ocr_b_salters_f334_chemistry_of_materials_the_materials_revolution

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  • Created by: Michael
  • Created on: 30-11-12 20:51

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SANDOWN BAY ACADEMY




OCR Chemistry B (Salters)
Notes, Task Sheets, Questions and Answers
Michael Chard




This document consists of notes from all kinds of sources, answers to task sheets given out during
lessons (which have not been carried out on paper) and any questions from text books and any
relevant…

Page 2

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OCR Chemistry B (Salters)
Michael Chard
Table of Contents
The Steel Story (SS) ................................................................................................................................. 3
Titrations ............................................................................................................................................. 3
Acid Based Titrations ...................................................................................................................... 3
Redox Titrations .............................................................................................................................. 3
Redox .................................................................................................................................................. 5
Rules for Oxidation States............................................................................................................... 5
Half-Reactions ................................................................................................................................. 6
Electrode Potentials ............................................................................................................................ 6
Standard Electrode Potentials ........................................................................................................ 7
Working out E…

Page 3

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OCR Chemistry B (Salters)
Michael Chard
The Steel Story (SS)

Specification:

An account of the production, properties and uses of steel, with reference to other metals. The
chemical ideas in this module are:

Redox reactions;
Electrode potentials;
d-block chemistry;
Colorimetry.

Titrations

There are two types of titrations we need to…

Page 4

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OCR Chemistry B (Salters)
Michael Chard
o Slowly add potassium manganate (VII) to the solution from a burette,
swirling gently until a pale pink colour persists. This will be the oxidising
agent.
o Repeat the titration until you have two titres within 0.1cm3.
o During the titration, iron (III) ions…

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OCR Chemistry B (Salters)
Michael Chard

6. 0.0200 x (27.5/1000 (we need to convert cm3 into dm3) ) =5.5 x 10-4 = number of moles of
MnO4-

7. The ratio of MnO4- to Fe2+ is 1:5, so we need to times the number of moles of MnO4- by 5.
This…

Page 6

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OCR Chemistry B (Salters)
Michael Chard
Half-Reactions

A redox reaction is made up of an oxidation half-reaction and a reduction half-reaction
Ionic equations can be written for each of these half-reactions. These are half-equations.
Half-equations can be combined to get the whole reaction.
For example in a displacement reaction, chlorine…

Page 7

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OCR Chemistry B (Salters)
Michael Chard
Cu2+ + 2e- Cu (copper 2+ going to cupper solid)
o Combining the half equations we get:
Cu2+ + Zn Zn2+ + Cu
Electrons flow through the wire from the most reactive metal to the least.
This could also be classed as electrons flow…

Page 8

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OCR Chemistry B (Salters)
Michael Chard
Working out E cell from Standard Electrode Potentials

Using the calculation E cell = (E more positive ­ E more negative)
The cell potential will always be a positive voltage, as the more negative value will be
subtracted from the more positive value (…

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OCR Chemistry B (Salters)
Michael Chard
Iron ­ Rusting, Recycling and Extraction

Rusting

Down to electrochemical processes
If iron is exposed to oxygen and water, rust can form.
It is a very simple process:
o There are two half equations:
2Fe (s) 2Fe2+ (aq) + 42e- (we need to balance…

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OCR Chemistry B (Salters)
Michael Chard
This means the zinc will be oxidised to Zn2+ ions in preference to iron. (it gives away it's
electrons more easily)
Spraying an object with a coating of zinc is called galvanising
Alternatively blocks of zinc can be bolted to iron, for example on…

Comments

aliarazim

these notes are very helpful

Aminah bibi

Really good notes very helpful thankyou!!

Michael

No worries Aminah

Jia

these aren't accessible anymore. please can you upload these again?

basicallybeyonce

These are so good! Really clear, you should look into a career in writing revision books perhaps ;)

Sarah457

I just came across these they look really good so far, have you got more notes on the other modules by any chance? :)

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